Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Nomeie o registro com o oponente de Christian Nielson.
 ###Tabelas: CREATE TABLE world_top_10_renewable_electricity_producers (world_top_10_renewable_electricity_producers_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Year INT, Total INT, Hydroelectricity INT, Wind Power INT, Biomass and Waste VARCHAR, Solar INT) CREATE TABLE local_channels (local_channels_id AUTO_INCREMENT PRIMARY KEY, Television service VARCHAR, Country VARCHAR, Language VARCHAR, Content VARCHAR, HDTV VARCHAR, Package/Option VARCHAR) CREATE TABLE list_of_presidents (list_of_presidents_id AUTO_INCREMENT PRIMARY KEY, Presidency INT, President VARCHAR, Date of Birth VARCHAR, Took office INT, Left office VARCHAR) CREATE TABLE round_two (round_two_id AUTO_INCREMENT PRIMARY KEY, Pick INT, Player VARCHAR, Position VARCHAR, Nationality VARCHAR, NHL team VARCHAR, College/junior/club team VARCHAR) CREATE TABLE mixed_martial_arts_record (mixed_martial_arts_record_id AUTO_INCREMENT PRIMARY KEY, Res. VARCHAR, Record VARCHAR, Opponent VARCHAR, Method VARCHAR, Event VARCHAR, Round VARCHAR, Time VARCHAR, Location VARCHAR)  
SELECT Record FROM mixed_martial_arts_record WHERE Opponent = christian nielson